<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>hello react</title>
</head>
<style>
  .title {
    background: skyblue;
  }
</style>

<body>
  <div id="test"></div>
  <script type="text/javascript" src="../js/react.development.js"></script>
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <script type="text/javascript" src="../js/babel.min.js"></script>
  <script type="text/babel">
    class MyComponent extends React.Component {
      constructor(props) {
        super(props)
        this.state = {
          isHot: false
        }
      }
      render() {
        const { isHot } = this.state
        return <h2 onClick={demo}>今天天气很{isHot ? '炎热' : '寒冷'}</h2>
      }
    }
    function demo() {
      console.log('被点击了');
    }
    ReactDOM.render(<MyComponent />, document.getElementById('test'))
  </script>

</body>

</html>